campbell



(No Model.) 7 2 Sheets-Sheet 1.

H. N. LAND & H CAMPBELL.

TRACTION ENGINE. No. 254,223. Patented Feb. 28,1882.

v UNITED STATES HORATIO N. LAND AND HOWARD OAMPBZELL, OF RICHMOND, INDIANA ASSIGNORS TO GAAR, @COTT & 00., OF SAME PLACE.

PATENT OFFICE.-

TRACTION-ENGINE.

SPECIFICATION forming part of Letters Patent No. 254,223, dated'FebruaryBS, 1882.

Application filed November 25, 1881. (No model.)

In the accompanying drawings, Figure l is' an elevation of the cylinder side of the machine; .Fig. 2, a plan View; Fig. 3, an elevation taken from the side opposite that shown in Fig. 1. Fig.4c is a detail view of part of the gearing, and Fig. 5 is a detail view of a portion of the under side of the engine, as will hereinafter be fully explained.

The boiler A is mounted upon main wheels B, turning loosely on axles 0 D. The front axle 0' is swiveled on a bar 0 which is sccured to and depends from the boiler near its forward end. The rear axle, D, is bowed down or U-shaped in the middle, 07, so as to receive and support the curved fire-box A, which fits in the bow, as seen in Figs. 1 and 5. This construction brings the boiler and fire-boxsufficiently low for convenience of the operators and greatly improves the engine, rendering it more compact and efficient, and the axle also serves to brace and strengthen the fire-box.

Each rear main wheel, B, carries an internally-geared ring, E and E. The ring E on the cylinder side of the engine gears with a pinion, e, keyed to the shaft c. This shaft turns in bearings 6 mounted on the forward end of the fire-boxA,close up undertheboiler proper, A, as best shown in Fig. 5. The ring E on the opposite side of the engine gears with a pinion, B, which turns loosely on .the shaft 0, and is formedin one piece with or firmly secured to a bevel-wheel, G. Another bevel-wheel, G, (see Fig. 2,)is mounted on the shaft 6, so as to turn with it, close to the firebox A, and between these two bevel-wheels G G a gear-wheel, H, is mounted loosely on the same shaft. This wheel H is shown detached in Fig. 4, from which it will be perceived it carries two small bevel-pinions, h h,

mounted loosely on pins Ii at right angh s to the axis of the wheel, and having their bearings between the rim of the wheel and the cross-pieces or chords h if. These bevelpinions h h gear on one side with the bGVtilJYllQGl G, fast on the shaft 0, and 011 the other side with the wheel G,loose on the sha t, butrigidly connected with the pinion F, which gears directly withthe internally-geared ring E.

The wheel H gears with thewheel 1,1nounted on a short stud-axle, i, projecting from the side of the boiler, and the wheel I in turn gears with a pinion, J, which slides on a feather on the driving-shaft J of the engine. This shaft J is mounted in bearings on the upper side of the boiler, and is driven by-the pitman J connected to the crank-wheel J The arrangement and organization of the boiler and steam-cylinder may be in any approved manner and construction.

The band-wheel K, from which the power of the engineis applied,is mounted upon the driving-shaft J, By sliding the pinion J toward the main wheel thedriving-shaftcan be thrown out of gear with the driving-gearing, and the engine will remain stationary while working. A suitable lever for shifting the sliding pinion .may be employed.

rotate on their bearing-pins and permit the unequal movement of the main wheels. The valve-rod L moves in a guide, L, at its outer end. Between this guide and the valve-chest a square stud or pin, 1, is pivoted in the valverod, which stud fits and slides in a slot, m, in

a vertically-movable and rocking block or link, M. This block M is connected by a link, a, with the crank-arm N of a rock-shaft, N, which rocks in bearings a on the top of the boiler,

and is controlled by a crank-arm, O, and rod P, which are moved back and forth by a lever, Q, which rocks in a guide, 0, and is provided with aspring-catch, 1, which engagesin notches on the guide. The slotted block M is thus held in any desired position.

Two pitmeu or rods, R R, which are reciproeated by their eccentrics R R on the driving-shaft, are connected with the slotted block M at different points, one near its upper and the other near its lower end.

It will be. understood from this description that the slotted block is rocked back and forth by the reciprocating pitmen, and that the hearing of the square pivoted lug on the valve-rod is always the center of motion. The movement vertically of the slotted back by its controllin g-lever changes the position of the square lug in the slot. At oneextreme ofmovement of the block the stud is at or near the top of the slot and at the other extreme at the bottom. The reciprocation of the valve-rod is thus regulated and controlled by the position of the square lug in the rocking slotted block, for it will be understood that when the square lug is at one end of the slot the motion of the valve-rod will be the reverse relatively to the ports of the cylinder of what it will be when the lug is at the opposite end of the slot, and that there will be intermediate points between these extremes by which the engine can be controlled and driven at any desired speed.

On the side of the boiler,just under the cylinder, is placed atubularreeeptacle, S, for tools.

A removable platform, T, for the engineer ortireman is swung from the rear of the engine. The platform is sustained by two vertical hooks or pins, t, which enter apertures near its inner edge, and by two link-rods, U, which extend from the outer edge of the platform to eyes a on the rear of the boiler. This stand is readily removable, and may be used or not, as desired.

verted arch adapted to support and strengthen 1 the fire-box, driving-wheels having internallytoothed gear-rings, the shaft journaled in bearin gs on the front of the fire-box, and having gears meshing with said internally-threaded toothed rings, and means for actuating said shaft, substantially as shown and described.

2. The combination, in a road or traction engine, of an arched axle surrounding the firebox, a shaft carrying at each end a gear-wheel supported on the forward end of the fire-box, the rear driving wheels having internallytoothed gear-rim gs, the bevel-wheel G, attached to and turning loosely with the gear F, bevel- Wheel G, mounted firmly on the shaft 0, gearwheel H, mounted loosely on the same shaft between the wheels G G, and provided with pinions h h, adapted to gear with said wheels and the driving-shaft J, and connecting mechanism, substantially as shown and described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

HORATIO N. LAND. HOWARD CAMPBELL.

Witnesses:

E. H. DENNIS, M. E. MCMEANS. 

